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Direct linkShadish, William R.; Galindo, Rodolfo; Wong, Vivian C.; Steiner, Peter M.; Cook, Thomas D. – Psychological Methods, 2011
In this article, we review past studies comparing randomized experiments to regression discontinuity designs, mostly finding similar results, but with significant exceptions. The latter might be due to potential confounds of study characteristics with assignment method or with failure to estimate the same parameter over methods. In this study, we…
Descriptors: Regression (Statistics), Experiments, Comparative Analysis, Nonparametric Statistics
Cook, Thomas D.; Shadish, William R.; Wong, Vivian C. – Journal of Policy Analysis and Management, 2008
This paper analyzes 12 recent within-study comparisons contrasting causal estimates from a randomized experiment with those from an observational study sharing the same treatment group. The aim is to test whether different causal estimates result when a counterfactual group is formed, either with or without random assignment, and when statistical…
Descriptors: Causal Models, Experiments, Pretests Posttests, Job Training
Peer reviewedCook, Thomas D. – New Directions for Evaluation, 2000
Offers a critical commentary on theory-based evaluation, stressing its utility as a method of program planning and as an adjunct to experiments but rejecting it as an alternative to experiments. Cites seven reasons for doubting that theory-based evaluations can provide the valid conclusions about a program's causal effects that proponents have…
Descriptors: Causal Models, Evaluation Methods, Experiments, Planning
